Letters 3.6

Therefore, you should note the following saying, taken from my reading in Pomponius: “Some men shrink into dark corners, to such a degree that they see darkly by day.” No, men should combine these tendencies, and he who reposes should act and he who acts should take repose. Discuss the problem with Nature; she will tell you that she has created both day and night. Farewell.

Seneca, Letters to Lucilius 3.6, translated by Richard Mott Gummere